An unusual phenotype in Drosophila is singed bristles.  Flie…

An unusual phenotype in Drosophila is singed bristles.  Flies with singed bristles look like they have survived an encounter with a blowtorch!  A geneticist first created a purebred culture of flies with singed bristles and then bred those flies with a purebred culture of wild flies (with normal bristles).  In the F1 generation, all flies had normal wild-type bristles.  When the F1 flies were allowed to mate among themselves, the following F2 generation was produced: 70 flies with singed bristles and 166 flies with normal bristles.  Determine a proposed inheritance of singed bristles and analyze the F2 data using chi-square (X2, chi-square) analysis.